86 BIOLOGICAL SURVEY OF 



Pemphigus Hartig 



P. popuLi-CAULis Fitch. Bar Harbor; Salisbury Cove, Aug. 

 Forms galls at the base of the leaves of poplar. 



P. RHois Fitch {Melapis Walsh). Pear-shaped or round red- 

 dish leaf galls are formed on sumac (Rhus) in September. 

 On Sept. 24, '37 at the foot of Newport Mt. I found the 

 larva of a Syrphid fly in many of these galls which when 

 bred proved to be Pipiza sp. 



HoRMAPHis Osten Sacken 



H. HAMAMELiDis Fitcli. Bar Harbor. Forming conical galls 

 on the leaves of the witch hazel {Hamamelis virginica) and 

 migrating to birch (Betula). 



Chermes Linnaeus 



C. ABiETis Linn. Spruce gall aphid. Bar Harbor. Forms 



the 'pineapple gall' on spruce. 

 C. sTROBiLOBius Kalteiibacli. The woolly larch gall. Salisbury 



Cove. 



CocciDAE. Scale insects 

 Lepidosaphes Shinier 



L. ULMi Linn. {Mytilas pis po^norum auct.). Oyster-shell bark 

 scale. Common, ash, mountain ash, and willow. 



Leucanitjm Burmeister 



L. QUERciFEX Fitch. Oak scale. Bar Harbor and Salisbury 

 Cove on red oak. 



Myzocallis Passerini 



M. sp. Corfield; flying Oct. 22 in large numbers at dusk. 



Xylococxtlus 

 X. BETULAE Perg. Found on birch all the year. 



Cryptococcus 

 C. FAGi Baer. Found on beech all the year. 



